如图,BD平分∠ABC,F在AB上,G在AC上,FC与BD相交于点H,∠3∠4=180°.试说明∠1∠2(请通过填空完善下列推理过程)
理由:因为∠3+∠4=180°(已知),
∠FHD=∠4( ).
所以∠3+ =180°
所以 ( ).
所以∠1= ( ).
因为BD平分∠ABC.
所以∠ABD= ( ).
所以 .
理由:因为∠3+∠4=180°(已知),
∠FHD=∠4( ).
所以∠3+ =180°
所以 ( ).
所以∠1= ( ).
因为BD平分∠ABC.
所以∠ABD= ( ).
所以 .
21-22七年级下·安徽黄山·期末 查看更多[4]
安徽省黄山市2021-2022学年七年级下学期期末数学试题河北省石家庄市藁城区2022-2023学年七年级下学期期末数学试题(已下线)河北省石家庄市栾城区2023-2024学年七年级上学期期末数学试题江苏省无锡市江阴市云亭中学2023-2024学年七年级下学期期中数学试题
更新时间:2022-08-01 00:21:28
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